Shitty idle, and longer start?

[JH32]

Does anyone else's RB20 idle funny?

Mine will sit at around 600rpm, and then "hunt" up and down between 600 and around 800rpm.

It's really annoying coz it feels like something's wrong.

This has happened since I got it, before any mods (ie. bov, bleed valve, fuel pump).

How can I fix this??

ALSO ...

now that I've fitted the bigger fuel pump, it seems like it's harder to start the car?

It takes longer for the car to start when you have the key turned?

What could this be?

[meggala]

your air flow meter could be damged o not working well this is common to the rb20's

meggala

[JH32]

Does a damaged air flow meter cause this the revs to hunt at idle?

How can I test it?

Can I fix it?

Could I clean it?

sorry for all the questions I am but new

[meggala]

you could try cleaning it there is a thread in here refering to it or replace it.

lowlux wrote the thread.

with the blow off you really need a plumb back not a vent to atmoshpere personally I run the stock one with a pod fitler its still fairly loud

m

[JH32]

OK cheers mate

yeah I saw that thread I'll try that carby clean stuff :uh-huh:

[adam 32]

make sure you let the fuel pump prime (takes 2-5secs and u can hear it buzzing) before you start the car. then it will start quicker, i had the same problem

[Clint32]

yep, with the the bigger bosch type pumps you need to let them prime for a few seconds before starting, just turn the key to on and wait for the pump to stop.

[JH32]

ahhhhhh ok ... hehe

cheers :Oops:

[TTT]

jimih.. all of the above are good points..

I'll add one more..

Also try reseting your ecu.

since you've got all these new mods, you should reset the ECU and then go for a thrash so that it learns things from scratch..

there is a thread on how to do this but here are quick instructions..

**disconnect battery.

**Step on brake pedal until all power is drained and the brake lights no longer come on.

**Plug battery back in.

**Start car, thrash it around for a few minutes around the streets.

**Done.

[JH32]

Cheers mate I'll do that!

[SLY33]

i had a REALLY annoying idle speed hunting deal going on with mine. A quick fiddle with the TPS and it was solved.

[JH32]

TPS?

what is dis?

[Guest Nismo_Freak]

TPS = Throttle Position Sensor

[blind_elk]

"Hunting" could be the early signs of the AAC valve starting to play up. Just needs a clean.

The "start" problem - I was reading last night that too-cold a plug can cause cold-start problems.

[JH32]

what is an AAC valve??

and what sort of cold-rated plugs should I use?

cheers!

p.s. sorry about all the questions!

[GTStR32]

now that I've fitted the bigger fuel pump, it seems like it's harder to start the car?  

It takes longer for the car to start when you have the key turned?

I have the same problem with it starting? Ifs ****ing annoying.

Could it be that its flooding?

[blind_elk]

AAC = Auxilliary Air Control (don't people read posts around here? I've lost count of the number of times I've had to explain that). Its at the back of the plenum chamber. Disconnect the orange plug to see if the idle stabilises.

You need to run a lower heat range number. I run a heat range 6. I think you may need to go to a heat range 5. Go to www.ngk.com.au - it has a FAQ about plugs and there is a question specifically about the heat range.

[Hicks]

Do you have some sort of computer ie. S-AFC?

Theres an option you can turn up and down, forgot what its called but its for atmospher bov's(stops the car kinda stalling when the boost is released) when this is on cold start is shit!

I turned it off on my car and haven't had any problems since.

But like others said, it could be your air flow metre.

[Hicks]

Originally posted by GTST

jimih.. all of the above are good points..

I'll add one more..

Also try reseting your ecu.

since you've got all these new mods, you should reset the ECU and then go for a thrash so that it learns things from scratch..

there is a thread on how to do this but here are quick instructions..

**disconnect battery.

**Step on brake pedal until all power is drained and the brake lights no longer come on.

**Plug battery back in.

**Start car, thrash it around for a few minutes around the streets.

**Done.

I read that on another site, didn't know if it was true or not. Didn't have the balls to try, thought it might **** up all my settings.

[JH32]

hehe yeah I think I'll try that ecu reset tomorrow night.

also I'll try the plugs and that aac thing.

but i dont have an safc. i'm going to get one though.